Where could I buy a Louis Vuitton briefcase strap?

I have Louis Vuitton briefcase that my aunt bought a couple years ago. The strap has been missing for a while and I would like to replace the strap with something similar that was on it. Any idea where I could find a replacement strap? I check the LV website with no luck of finding a single strap. Thanks for your help!|||The best thing to get one is either to go to a shoemaker or to a somebody who makes coats out of fur.